another way to tell if the V8 is a change is the front mounts were riveted on at the factory, bolted on if done later, and really fake would be add-on side engine mounts - and of course, a 55/56 should have a 265 if still an 'unmolested' original
the Factory Assembly Manual is a pretty good guide for the 55/56, it even includes the right hand drive details, which were primarily assembled in Canada for export, the differences not shown are the series designations, particularly for the emblems ....
56 paint chipsBill